The Collaborative International Dictionary of English v.0.48:

vitamin Bc \vitamin Bc\ n.
   a B vitamin that is essential for cell growth and
   reproduction. Also called folic acid

   Syn: vitamin M, folic acid, folacin, pteroylglutamic acid,
        pteroylmonoglutamic acid.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

vitamin Bc
    n 1: a B vitamin that is essential for cell growth and
         reproduction [syn: vitamin Bc, vitamin M, folate,
         folic acid, folacin, pteroylglutamic acid,
         pteroylmonoglutamic acid]